Knife sheath



FIG. 1 is a top and left side perspective view of the knife sheath showing our new design;

FIG. 2 is a top and right side perspective view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a front elevation view. 

CLAIM The ornamental design for a knife sheath, as shown and described. 